Configuration Guide Configuring IPv6
A device detects unreachable neighbors based on the configured reachable time. The shorter the
configured reachable time, the faster the device detects unreachable neighbors but the more it
consumes network bandwidth and device resources. Therefore, it is not recommended to set this time
too small.
The configured value is advertised in an RA packet and is also used on the device. If the value is 0, the
reachable time is not specified on the device and it is recommended to use the default value.
 Configuring the Address Prefix to Be Advertised in an RA Packet
ipv6 nd prefix {ipv6-prefix/prefix-length | default} [ [ valid-lifetime { infinite | preferred-lifetime } ] | [ at
valid-date preferred-date ] | [infinite {infinite | preferred-lifetime}]] [no-advertise] | [[ off-link ]
[ no-autoconfig ]]
ipv6-prefix: Indicates the network ID of IPv6, which must comply with the address representation format
in RFC 4291.
prefix-length: Indicates the length of the IPv6 address prefix. A slash (/) must be added before the prefix.
valid-lifetime: Indicates the period when a host receiving the prefix of an RA packet regards the prefix
valid. The value ranges from 0 to 4,294,967,295. The default value is 30 days.
preferred-lifetime: Indicates the preferred period when a host receiving the prefix of an RA packet
regards the prefix valid. The value ranges from 0 to 4,294,967,295. The default value is 7 days.
at valid-date preferred-date: Indicates the valid date and preferred deadline configured for the RA prefix.
It uses the format of dd+mm+yyyy+hh+mm.
infinite: Indicates that the prefix is permanently valid.
default: Indicates that the default parameter configuration is used.
no-advertise: Indicates that the prefix is not advertised by a router.
off-link: If the prefix of the destination address in the IPv6 packet sent by a host matches the configured
prefix, the device regards the destination address on the same link and directly reachable. This
parameter indicates that this prefix does not require on-link determination.
no-autoconfig: Indicates that the prefix in the RA packet received by a host cannot be used for address
auto-configuration.
Interface configuration mode
This command can be used to configure parameters related to each prefix, including whether to
advertise this prefix. By default, an RA packet uses the prefix configured by running the ipv6 address
command. Run the ipv6 nd prefix command to add other prefixes.
Run the ipv6 nd prefix default command to configure the default parameters for an interface. That is, if
no parameter is specified when a prefix is added, use the parameters configured in the ipv6 nd prefix
default command as the parameters of the new prefix. The default parameter configurations are
abandoned once a parameter is specified for the prefix. That is, when you use the ipv6 nd prefix
default command to modify the default parameter configurations, only the prefix configured for the
default parameters changes and configurations of the prefix remain the same.
at valid-date preferred-date: You can specify the valid date of the prefix in two methods: 1) specifying a
fixed time for each prefix in an RA packet; 2) specifying the deadline. In the second method, the valid
date of the prefix in each RA packet decreases till it becomes 0.
 Enabling/Disabling RA Suppression on an Interface
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